package day0612;

public class Test3 {
    public static void main(String[] args) {
        String  s="A";
        char[] srs=s.toCharArray();
        //用String文件的toCharArray方法将字符串转化为字符数组


        char    c=srs[0];

        System.out.println('A'<=c &&  c<='z');

        System.out.println((int)'A');
        System.out.println((int)'z');
    }
}
